Machine to countersink twenty holes in a wheel hub shell for long spokes



June 5, 1934. TORMYN r AL 1,961,404

MACHINE TO COUNTERSINK TWENTY HOLES IN A WHEEL HUB SHELL FOR LONG SPOKESFiled July 29, 1952 4 Sheets-Sheet l M WY W June 5, 1934. H. TORMYN ETAL MACHINE TO COUNTERSINK TWENTY HOLES IN A WHEEL HUB SHELL FOR LONGSPOKES Filed July 29, 1952 4 Sheets-Sheet 2 A R W Gamma/g! June 5, 1934.H. TORMYN El AL MACHINE TO COUNTERSINK TWENTY HOLES IN A WHEEL HUB SHELLFOR LONG SPOKES Filed July 29, 1932 4 Sheets-Sheet 4 Gamma/13) PatentedJune 5, 1934 oru'rso STATES:

PATENT OFFICE MACHINE TO COUNTERSINK TWENTY HOLES IN A WHEEL HUB SHELLFOR LONG SPOKES Application July 29, 1932, Serial No. 625,994

Claims.

This invention relates to machines for the manufacture of wire wheelsand has particular reference to a machine or die for countersinking thelong spoke openings in the wheel hub.

A machine for forming the spoke openings in the hub shell for the longspokes is described and claimed in copending application Serial No.625,993, filed July 29, 1932. The machine of the present invention hasfor its object the countersinking of the openings formed by the machineof the application referred to. In applying the spokes to the hub of thewire wheel it is necessary that the openings be countersunk at theinterior of the hub and the object of the present invention is toconstruct a die which will perform the countersinking operation.

The machine generally comprises upper and lower die shoes mounted in aconventional press. The lower die shoe includes a holder element for thewheel hub slidably mounted on the shoe, 2; centering attachmentconcentrically mounted relative to the hub holder and a backing ring forthe hub rigidly to hold the hub when the countersinking punches areoperated. A cam is mounted centrally of the die shoe to expand thesegments of an expandible head inside the hub when the head descends onto the lower die shoe. The segments have countersinking punches mountedtherein and when the hub is expanded the punches str'ikethe openings toform a countersink.

On the drawings:

Figure 1 is a front view of a press having the die of the inventionapplied thereto.

3 Figure 2 is a side view of Figure 1.

Figure 3 is an enlarged detail view partly in section showing theposition of the parts when the top die has descended on the die shoe andwhen the punches are countersinking the open- 40 ings in the hub shell.

Figure i is a View corresponding to Figure 3 but showing the top die anddie shoe separated and with one of the segments in dotted line positionafter it has left the cam surfaces of the 45 central cam.

Figure 5 is a view taken substantially on the line 5-5 of Figure 4.

Figure 6 is a perspective View of one of the segments of the expandiblehead.

" Figure 7 is a section through a part of the hub showing a spokeopening before countersinking.

Figure 8 is a section similar to Figure 7 but showing one of theopenings substantially as it appears after countersinking.

Referring to the drawings, the numeral 2 indicates the machine or pressof the invention as a whole. The press comprises the upright frame atthe upper portion of which an electric motor 4 is mounted. The motor hasthe driving pulley 6 which drives a belt 8 which in turn drives aflywheel 10 rigidly mounted on the axle 12 which extends across theframe of the machine and at the opposite side has a small gear wheel(not shown) mounted thereon which meshes with and drives the large gear14 rigidly mounted on the shaft 16 having a crank 18 intermediate itsends. The crank 18 has attached thereto the connecting rod 20 whichoperates the crosshead 22 suitably attached to the top shoe 24 of thedie. The lower die shoe is indicated at 26 and a part thereof isresiliently mounted on the pressure pins 36 resting on'a plate 30.Suitable pins 32 connect the plate 30 with the plate 34 secured to apiston rod 28 connected to a piston operating in a cylinder 37 to forman air cushion. The pins 36 abut at their lower ends against the plate30 and at the upper ends against thebottom of the slide holder 38(Figures 3 and 4). This structure gives a resilient mounting to theslide holder.

A handle 40 operating a linkage system 42 operates a suitable clutch(not shown) which causes the small gear on the end of the shaft 12 to beengaged with the shaft and to rotate the gear 14. After one operation ofthe punch a suitable throw-out mechanism will throw the clutch out ofengagement with the gear. This mechanism is not shown but isconventional and well known in the art. A suitable brake drum is shownat 44. having brake shoes 46 operated from a suitable linkage 48.

The parts so far described are conventional and are well known in theart of presses.

Referring to Figures 3 and 4 it will be seen that the lower shoe 26 hasan annular groove 50 therein at the outer periphery of which theretaining ring 52 is secured by means of the machine bolts 54. The ring52 has the inwardly projecting annular flange 56 which cooperates with asimilar flange 58 on the slidable holder 38 for the wheel hub 62. Theholder 38 is adapted to slide on the surfaces at 64 and is held fromrotation by means of the plungers 66 sliding in openings 68 in theholder 38 and rigidly mounted as at 70 in the die shoe 26. The pressurepins 36 strike against the-bottom of the holder 38 and constantly urgeit toward the position shown in Figure 4. The upper portion of theholder 38 is shaped as shown at 72 to correspond to the shape of thewheel hub 62.

A backing ring '74 is centrally mounted on the die shoe 26 immediatelyinside the slidable holder 38. The backing ring is tapered at its upperportion as shown at '76 and at its bottom is positioned as at 78 at theinner periphery of the groove 50.

A central ring-like member 80 is mounted on the die shoe 26concentrically with the backing ring 74 and the holder 38 and is securedto the die shoe in any suitable way such as by machine bolts. The ring80 extends over a flange 82 on the backing ring 74 rigidly to hold thering in position and at its inner periphery has an under-cut portion 84which extends over a flange 86 on the head of the cam 88 rigidly to holdthe cam in position centrally of the die shoe 26.

A locating ring 90 having the locating flange 92 with an inclinedsurface at its upper portion is slidably mounted in a recess 94 formedbetween the backing ring 74 and an annular rabbet on the ring 80. Thelocator ring 90 is spring-pressed away from the ring 80 by means of aplurality of coil springs 96 positioned between the rings 80 and 90 andresting in recesses formed in both members. Guide bolts 98 are screwedinto the locator ring 92 and have their heads resting against a shoulderon the ring 80. The ring 80 has the openings 100 therein to allow theheads to slide. Preferably three springs 96 and three guide bolts 98,each 120 apart, are used.

The cam 88 has the inclined cam portions 102 and 104 which act on theinclined portions 106 and 108 formed on each of the ten segments 110 ofan expandible head 112 secured to the top die 24.

The head 24 has secured thereto by means of the machine bolts 114 aplate 116 having the opening 118 at its center and ten radially disposedrecesses 120. In each recess there is mounted a spring 122 one end ofwhich bears against the outer end of the recess while the inner end actson a pin 124. One pin 124 is secured at the top of each segment 110.There are as many recesses 120, springs 122 and pins 124 as there aresegments 110.

A retaining ring 126 secured to the plate 116 by means of machine screws128 holds a mounting ring 130 having an annular shoulder 132 on whichthe projections 134 of the segments 110 are slidable. The segmentslikewise have a rib 136 at their upper portion which slide in acorresponding groove on the under-face of the plate 116.

A second series of ten coil springs 138 is mounted in recesses 140formed in the mounting ring 130 and held in place by means of the blocks142. The two sets of springs 122 and 138 constantly urge the segments110 inwardly. The segments expand outwardly as determined by the camfaces 102 and 104 and the shoulder at 132 provides ample space to allowthe segments to expand the full distance demanded by the cam 88.

At the lower end of each segment 110 the countersinking punches 144 aremounted. These punches 144 fit into the spoke openings 146 at the narrowportion of the wheel hub, or the lower portion as shown in Figures 3 and4, to expand the inner side of openings or form the countersinks whenthe parts are in the position shown in Figure 3.

The operation of the press and dies is as follows: The parts aresubstantially in position as shown in Figure 4 when the operator placesa wheel hub shell 62 on the holder 38. The flange has previously had theopenings for the short and long spokes of the wheel formed therein andis properly positioned on the holder by means of the locator 147 bycausing the spring-pressed pin 148 to fit into one of the springs forthe short spokes definitely to position the hub. The operator now movesthe handle 40 to cause the plunger to descend once. the mechanism beingso arranged that the clutch will be thrown out after the plunger hasonce operated. The downward movement of the top die 24 will cause it tomove from the position shown in Figure 4 to that shown in Figure 3. Inthe downward movement when the surfaces 106 and 108 of the segments 110strike the cam faces at 102 and 104, the expandible head 106 willexpand, the segments 110 moving from the position of Figure 4 to that ofFigure 3. After the surfaces 106 and 108 leave the cam surfaces 102 and104 the segments will dwell until they reach the lowermost position oftheir movement. The spacer blocks shown at 150 (Figure 3) strike theupper portion of the holder 38 at the same time that the surface 152 onthe lower portion of the mounting ring 130 strikes the correspondingpart of the wheel hub so that the blocks 150 will new force the holder60 down against the upward force on the pressure pins 36 and cause it tomove along with the head 112 and the top die 24. Before the punches 144strike the spoke openings the opening in the small end of the hub willstrike the flange 92 on the positioning ring 90 accurately to positionthe hub with reference to the punches. The small end of the hub willlikewise enter the backing ring 74 to furnish a solid backing for theoperation of the punches. The continued downward movement will cause thecams 102 and 104 to force the segments 110 and the punches 144 into theopenings '146'in the hub to form the countersinks. The locating ring 90will be forced downward against the pressure of the springs 96 as shownin Figure 3, and the inclined surface thereof will cooperate with theinclined surface 148 on the bottom end of the segments accurately toguide the segments to the spoke holes. After the punches have formed thecountersinks the top die 24 will rise, the segments 110 dwellingbackward and finally moving over the cam surfaces 102, 104 causing thesprings 122 and 138 to push the segments inwardly or toward the positionshown in Figure 4. The plungers 36 will push the holder 38 upward untilthe flanges 56 and 58 contact, while the springs 96 will push thelocating ring 90 upward to the position shown in Figure 4. When the topplate 24 has reached the upper limit of its (2;

movement the wheel hub 62 may be withdrawn and anew one put in its placeand the operation of countersinking recommeneed.

In Figure 7 the letter A indicates one of the openings in the hub beforethe countersinking in operation has taken place and in Figure 8 theletter B indicates one of the holes after it has been countersunk by themachine of the application.

We claim:

1. In a machine of the class described, a die shoe, a reciprocable wheelhub holder mounted on said die shoe, means to guide said holder in saidshoe, a locator on said holder definitely to position said hub, said hubhaving a plurality of spoke openings, means on said shoe to center saidhub, a cam on said die shoe, a top die reciprocable relative to said dieshoe, an expandible head on said top die, said head composed of aplurality of movable parts, punches on each of said parts, said movableparts striking the cam on the downward movement of the top die to causethe movable parts to expand and the punches to countersink the openingsin the wheel hub.

2. In a machine of the class described, a die shoe, a reciprocable wheelhub holder mounted on said die shoe, means to guide said holder on saidshoe, a locator on said holder definitely to position said hub, said hubhaving a plurality of spoke openings, a cam on said die shoe, a top diereciprocable relative to said die shoe, an expandible head on said topdie, said head composed of a plurality of movable parts, punches on eachof said parts, said movable parts striking the cam on the downwardmovement of the top die to cause the movable parts to expand and thepunches to countersink the openings in the wheel hub.

3. In a machine of the class described, a die shoe, a reciprocable wheelhub holder mounted on said die shoe, means to guide said holder on saidshoe, means on said shoe to center said hub, said hub having a pluralityof spoke openings, a cam on said die shoe, a top die reciprocablerelative to said die shoe, an expandible head on said top die, said headcomposed of a plurality of movable parts, punches on each of said parts,said movable parts striking the cam on the downward movement of the topdie to cause the movable parts to expand and the punches to countersinkthe openings in the wheel hub.

4. In a machine of the class described, a die shoe, a reciprocable wheelhub holder mounted on said die shoe, means to guide said holder on saidshoe, a locator on said holder definitely to position said hub, said hubhaving a plurality of spoke openings, a cam on said die shoe, a top diereciprocable relative to said die shoe, an expandible head on said topdie, said head composed of a plurality of movable parts, punches on eachof said parts, said movable parts striking the cam on the downwardmovement of the top die to cause the movable parts to expand and thepunches to countersink the openings in the wheel hub, and means on thetop die to force the holder downward when the cam is expanding the headso that the head, wheel hub and holder will move together at theisamespeed.

5. In a machine of the class described, a die shoe, a reciprocable wheelhub holder mounted on said die shoe, means to guide said holder on saidshoe, a locator on said holder definitely to position said hub, said hubhaving a plurality of spoke openings, a cam on said die shoe, a topdiereciprocable relative to said die shoe, an expandible head on said topdie, said head composed of a plurality of movable parts, punches on eachof said parts, said movable parts striking the cam on the downwardmovement of the top die to cause the movable parts to expand and thepunches to countersink the openings in the wheel hub, and means mountedon the die shoe to form a backing for the wheel hub when the punches arecountersinking the openings.

6. In a machine of the class described, a die shoe, a holder resilientlymounted in the die shoe and adapted to receive and hold a wheel hub,said hub having a plurality of spoke openings, stationary means to backthe wheel hub on the outer side, a cam on. the die shoe, a top diereciprocable relative to the die shoe and holder, an expandible headonzthe top die, said cam being received in said head to expand the sameinside the hub when the top die is reciprocated, a plurality of puncheson -said head, the expansion of said head causing the punches to movetoward the hub to countersink the spoke openings.

7. In a machine of the class described, a die shoe, a holder resilientlymounted in the die shoe and adapted to receive and hold a wheel hub,said hub having a plurality of spoke openings, a stationary memberadapted to back the wheel hub when the holder is moved, a cam on the dieshoe, a top die reciprocable relative to the die shoe and holder, anexpandible head on the top die, said cam being received in said head toexpand the same inside the hub when the top die is reciprocated, aplurality of punches on said head, the expansion of said head causingthe punches to move toward the hub to countersink the spoke openings.

8. In a machine of the class described, a die shoe, a holderreciprocably mounted in the die shoe and adapted to receive and hold awheel hub, said hub having a plurality of spoke openings, a stationarybacking ring mounted on the die shoe, and adapted to back the wheel hubwhen the holder is moved, a cam on the die shoe, a top die reciprocablerelative to the die shoe and holder, an expandible head on the top die,said cam being received in said head to expand the same inside the hubwhen the top die is reciprocated, a plurality of punches on said head,the

expansion of said head causing the punches to -move toward the hub tocountersink the spoke openings.

9. In a machine of the class described, a die shoe, a reciprocableholder mounted in the die shoe and adapted to receive and hold a wheelhub, said hub having a plurality of spoke openings, means mountedconcentrically with the die shoe and adapted to be received in the hubto position the same, means to back the wheel hub on the outer sidethereof, a cam on the die shoe, a top die reciprocable relative to thedie shoe and the holder, an expandible head on the top die, said cambeing received in said head to expand the same inside the hub when thetop die is reciprocated, a plurality of punches on said head, theexpansion of said head causing the punches to move toward the hub tocountersink the spoke openings.

10. In a machine of the class described, a die shoe, a backing ringrigidly mounted on the die shoe, a holder slidably engaging the backingring and slidably mounted on the die shoe, said die shoe adapted toreceive and hold a wheel hub, said hub having a plurality of spokeopenings, a positioning ring slidably mounted in the backing ring andadapted to extend into the hub accurately to position the wheel hub, acam on the die shoe, an expandible head reciprocable relative to the dieshoe, a plurality of punches on said head, and means to cause the headto be reciprocated over the cam to cause the head to expand inside thehub to cause the punches to countersink the spoke openings, the movementof said top die causing the holder to slide over the backing ring andcausing the hub to be received over the positioning ring to position thehub for the action of the punches.

HERMAN TORIAYN. FRANK F. WIETHOFF.

